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fix(ssr): properly init slots during ssr rendering #12441

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fix(ssr): properly init slots during ssr rendering #12441

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@edison1105 edison1105 commented Nov 20, 2024 •
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close #12438

during SSR rendering, the optimized parameter passed to initSlots is always false. The slots._ flag is lost when initSlots is called in setupComponent for the child component. This triggers the logic inside normalizeObjectSlots, resulting in slotFn returning an array that includes a comment node.

core/packages/server-renderer/src/helpers/ssrRenderSlot.ts

Lines 59 to 65 in 413c923

const ret = slotFn(
slotProps,
bufferedPush,
parentComponent,
slotScopeId ? ' ' + slotScopeId : '',
)
if (isArray(ret)) {

related commit 3d34f40#diff-56930a63772d2e89f19432918b9d6ed851ede4159b0d32404e0c1d8c159fec99R1232
SSR rendering does not need to patch slots, so there won't be an issue similar to #10870. Perhaps the optimized parameter can always be set to true.

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github-actions bot commented Nov 20, 2024 •
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Size Report

Bundles

File Size Gzip Brotli
runtime-dom.global.prod.js 100 kB (+3 B) 37.9 kB (-1 B) 34.2 kB (-2 B)
vue.global.prod.js 158 kB (+3 B) 57.8 kB (+3 B) 51.5 kB (+99 B)

Usages

Name Size Gzip Brotli
createApp (CAPI only) 47.2 kB (+3 B) 18.3 kB (+2 B) 16.8 kB (-3 B)
createApp 55.2 kB (+3 B) 21.3 kB (+2 B) 19.5 kB (-6 B)
createSSRApp 59.3 kB (+3 B) 23.1 kB (+4 B) 21 kB (+1 B)
defineCustomElement 60.1 kB (+3 B) 22.9 kB (+3 B) 20.9 kB (+3 B)
overall 69.1 kB (+3 B) 26.5 kB (+2 B) 24.1 kB (+15 B)

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commit: 413c923

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Copilot AI reviewed Nov 20, 2024
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Copilot reviewed 2 out of 2 changed files in this pull request and generated no suggestions.
@edison1105 edison1105 added ready to merge The PR is ready to be merged. scope: ssr 🔨 p3-minor-bug Priority 3: this fixes a bug, but is an edge case that only affects very specific usage. labels Nov 20, 2024
@edison1105 edison1105 changed the title fix(ssr): properly handle ssr slot and fallback fix(ssr): properly init slots during ssr rendering Nov 20, 2024
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🔨 p3-minor-bug Priority 3: this fixes a bug, but is an edge case that only affects very specific usage. ready to merge The PR is ready to be merged. scope: ssr
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slot with always-true condition is not rendered on ssr
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